Details

Updated firefox packages that fix several security issues and one bug arenow available for Red Hat Enterprise Linux 4, 5, and 6.

The Red Hat Security Response Team has rated this update as having criticalsecurity impact. Common Vulnerability Scoring System (CVSS) base scores,which give detailed severity ratings, are available for each vulnerabilityfrom the CVE links in the References section.

Mozilla Firefox is an open source web browser. XULRunner provides the XULRuntime environment for Mozilla Firefox.

A flaw was found in the way Firefox handled malformed JPEG images. Awebsite containing a malicious JPEG image could cause Firefox to crash or,potentially, execute arbitrary code with the privileges of the user runningFirefox. (CVE-2011-2377)

Multiple dangling pointer flaws were found in Firefox. A web pagecontaining malicious content could cause Firefox to crash or, potentially,execute arbitrary code with the privileges of the user running Firefox.(CVE-2011-0083, CVE-2011-0085, CVE-2011-2363)

Several flaws were found in the processing of malformed web content. A webpage containing malicious content could cause Firefox to crash or,potentially, execute arbitrary code with the privileges of the user runningFirefox. (CVE-2011-2364, CVE-2011-2365, CVE-2011-2374, CVE-2011-2375,CVE-2011-2376)

An integer overflow flaw was found in the way Firefox handled JavaScriptArray objects. A website containing malicious JavaScript could causeFirefox to execute that JavaScript with the privileges of the user runningFirefox. (CVE-2011-2371)

A use-after-free flaw was found in the way Firefox handled malformedJavaScript. A website containing malicious JavaScript could cause Firefoxto execute that JavaScript with the privileges of the user running Firefox.(CVE-2011-2373)

It was found that Firefox could treat two separate cookies asinterchangeable if both were for the same domain name but one of thosedomain names had a trailing "." character. This violates the same-originpolicy and could possibly lead to data being leaked to the wrong domain.(CVE-2011-2362)

For technical details regarding these flaws, refer to the Mozilla securityadvisories for Firefox 3.6.18. You can find a link to the Mozillaadvisories in the References section of this erratum.

This update also fixes the following bug:

* With previous versions of Firefox on Red Hat Enterprise Linux 5, the"background-repeat" CSS (Cascading Style Sheets) property did not work(such images were not displayed and repeated as expected). (BZ#698313)

All Firefox users should upgrade to these updated packages, which containFirefox version 3.6.18, which corrects these issues. After installing theupdate, Firefox must be restarted for the changes to take effect.

Solution

Before applying this update, make sure all previously-released erratarelevant to your system have been applied.